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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <div style="width: 100px; height: 100px; background-color: rebeccapurple; position: absolute; left:0;top:0"></div>
    <script src="common.js"></script>
    <script>
        let timer;
        document.querySelector('div').onclick = function () {
            timer = setInterval(() => {
                // 获取当前的left值
                let currentStyle = parseInt(getStyle(this, 'left'));
                if (currentStyle == 800) {
                    // 已经到达终点
                    clearInterval(timer);
                } else {
                    this.style.left = currentStyle + 5 + 'px';
                }
            }, 30);
        }
    </script>
</body>

</html>